As AACHP said, two showers and a dishwasher is not a major draw.
When contractors and consumers complain about flow rate, it is not a myth.
My 'bottom line fact' is that you will never recoup the thousands invested from your natural gas bill.
I’m glad you are happy with your tankless, but there are mixed feelings from within the industry as to their actual efficiency and comparable functionality. If you haven’t heard negative views of tankless units from professionals, you have probably done selective research. This thread consists of strictly contractors, unlike here, who shed a different light on them. http://forums.jlconline.com/forums/s...+water+heaters